WO2019213163A1 - Dispositif de conditionnement de mode optique mmf - Google Patents

Dispositif de conditionnement de mode optique mmf Download PDF

Info

Publication number
WO2019213163A1
WO2019213163A1 PCT/US2019/030047 US2019030047W WO2019213163A1 WO 2019213163 A1 WO2019213163 A1 WO 2019213163A1 US 2019030047 W US2019030047 W US 2019030047W WO 2019213163 A1 WO2019213163 A1 WO 2019213163A1
Authority
WO
WIPO (PCT)
Prior art keywords
waveguide
optical device
optical
fiber
index
Prior art date
Application number
PCT/US2019/030047
Other languages
English (en)
Inventor
Gary Landry
Timo GRAY
Jason O'daniel
Original Assignee
Finisar Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Finisar Corporation filed Critical Finisar Corporation
Publication of WO2019213163A1 publication Critical patent/WO2019213163A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0288—Multimode fibre, e.g. graded index core for compensating modal dispersion
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/14—Mode converters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/268—Optical coupling means for modal dispersion control, e.g. concatenation of light guides having different modal dispersion properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2581—Multimode transmission

Definitions

  • the present disclosure generally relates to transmission of optical signals in multimode optical fibers (MMF).
  • MMF multimode optical fibers
  • Multi -mode optical fiber is a type of optical fiber mostly used for communication over short distances, such as within a building or on a campus.
  • Multi-mode fiber has a relatively large core diameter that enables multiple light modes to be propagated and limits the maximum length of a transmission link because of modal dispersion. Because of its relatively high capacity and reliability, multi-mode optical fiber generally is used for backbone applications in buildings, although there are other applications for multi-mode fibers.
  • the present disclosure generally relates to transmission of optical signals in multimode optical fibers (MMF).
  • MMF multimode optical fibers
  • an optical device may include a waveguide having a core index of refraction that decreases along a length of the waveguide and an edge index of refraction of the waveguide that is substantially constant along the length of the waveguide.
  • the optical device may be a radial symmetric waveguide.
  • the optical device may be a fiber stub or a graded-index optic.
  • the optical device may be positioned mid-span in an optical fiber.
  • the optical device may be optically coupled to a first fiber core and a second fiber core.
  • the optical device may include a constant diameter between the first fiber core and the second fiber core. The constant diameter may correspond to a diameter of the first fiber core and a diameter of the second fiber core.
  • the optical device may be mechanically coupled to a first fiber core and a second fiber core.
  • the waveguide may decrease dispersion of the optical signals travelling through the fiber cores.
  • the central rays of optical signals travelling through the waveguide may be refracted towards higher radii while the outer rays propagate unaffected.
  • an optical fiber may include the optical device including some or all of the aspects described above.
  • the optical device may be positioned between a first portion of the optical fiber and a second portion of the optical fiber.
  • the optical device may be positioned between a first end of the optical fiber and a second end of the optical fiber.
  • the optical device and the optical fiber may be configured to propagate multi-mode optical signals and/or shortwave optical signals.
  • an optical device may include a waveguide having a first index of refraction proximate a center of the waveguide that decreases along a length of the waveguide and a second index of refection of the waveguide proximate a periphery of the waveguide that is constant along the length of the waveguide.
  • the optical device may be a radial symmetric waveguide, a fiber stub or a graded-index optic.
  • the optical device may be positioned mid-span in an optical fiber.
  • the optical device may be optically coupled to a first fiber core and a second fiber core and the optical device decreases dispersion of the optical signals travelling through the fiber cores.
  • the central rays of optical signals travelling through the optical device may be refracted towards higher radii while the outer rays propagate unaffected.
  • Figure l is a schematic view of an example optical device.
  • Figure 2 is a schematic view of the refractive index profile of the optical device of Figure 1
  • Multi -mode optical fiber is a type of optical fiber mostly used for communication over short distances, such as within a building or on a campus.
  • Multi-mode fiber has a relatively large core diameter that enables multiple light modes to be propagated and limits the maximum length of a transmission link because of modal dispersion. Because of its relatively high capacity and reliability, multi-mode optical fiber generally is used for backbone applications in buildings.
  • multi-mode optical fibers have much larger core diameters when compared to single-mode optical fibers.
  • multi-mode optical fibers typically have core diameters in the range of 50-100 micrometers, and also typically carry relatively larger wavelengths of light it. Because of the larger core and also the capability of using a large numerical aperture, multi-mode fibers generally have a higher "light-gathering" capacity than single-mode fiber. In practical terms, the larger core size simplifies connections and also allows the use of lower-cost electronics such as light-emitting diodes (LEDs) and vertical-cavity surface-emitting lasers (VCSELs). In some configurations, multimode lasers may operate at 850 nm and 1300 nm wavelengths.
  • single-mode fibers used in telecommunications typically operate at 1310 or 1550 nm.
  • the multi-mode fiber bandwidth-distance product limit is lower. Because multi-mode fiber has a larger core-size than single-mode fiber, it supports more than one propagation mode. Accordingly, multi-mode fiber is limited by modal dispersion, while single mode fiber generally is not.
  • the light sources sometimes used with multi-mode fiber produce a range of wavelengths and these each propagate at different speeds.
  • chromatic dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. Media having this common property may be termed a dispersive media.
  • This chromatic dispersion is another limit to the useful length for multi-mode fiber optic cable.
  • the light sources used to drive single-mode fibers generally produce coherent light of a single wavelength. Because of the combined modal and chromatic dispersion, multi-mode fiber has higher pulse spreading rates than single mode fiber, limiting multi -mode fiber’s information transmission capacity.
  • the length of multi-mode fibers are generally more limited than the length of single mode fibers.
  • inventions that permit using multimode fibers over longer distances while using standard transceivers. Additionally or alternatively, embodiments may be implemented to maintain the long reaches possible with mode conditioned transceivers in datacenters with impairments in their fiber plant.
  • the disclosed embodiments include standalone optical devices that may be implemented with conventional optical transmitters and transceivers.
  • the optical device may be distinct from the transmitter. Additionally or alternatively, the optical device may be small enough to be added to a fiber panel that could take an unconditioned modal pattern in a multi-mode fiber and convert it to a mode pattern that can propagate long distances.
  • Some embodiments may be implemented to create a mode conditioned launch property in an already installed standard emission transceiver. Such implementations may be useful to maintain the existing optical fiber length when upgrading to a higher line rate. Additionally or alternatively, implementations may be used when a mode conditioned transceiver is not meeting the expected length benefit due to flaws in the existing fiber panel (e.g., poorly aligned connectors on a patch panel causing mode coupling to a faster central ray). Additionally or alternatively, the described embodiments may be implemented to recondition the optical power in optical fibers into the proper modes, restoring the intended target reach.
  • a radial symmetric waveguide may be implemented.
  • the core index of refraction of the radial symmetric waveguide may decrease along its length while the index of refection at the edge stays constant.
  • the central rays may be refracted towards higher radii while the outer rays propagate unaffected.
  • the radial symmetric waveguide could be fabricated as a fiber stub or as a graded-index optic.
  • the radial symmetric waveguide may be positioned between two standard optical fibers. The radial symmetric waveguide may decrease dispersion of the optical signals travelling through multimode optical fibers, thereby increasing the length that multimode optical fibers may be used without decreasing signal quality.
  • the radial symmetric waveguide may be implemented as an optical device that does not require electrical power.
  • the radial symmetric waveguide may increase the distances that optical signals may be transmitted through multimode optical fibers without requiring modifications to existing optical fibers, transceivers, or lasers.
  • Figure 1 illustrates a schematic view of an example optical device 100.
  • the optical device 100 may be positioned mid-span in an optical fiber. In other configurations, the optical device 100 may be positioned between two standard optical fibers. Accordingly, the optical device 100 may be optically and/or mechanically coupled to a first fiber core 102 and a second fiber core 104.
  • the fiber cores 102, 104 may be multimode fiber cores.
  • the optical device 100 may include a waveguide 106 positioned between and optically coupled to the fiber cores 102, 104.
  • the waveguide 106 may be fabricated as a fiber stub or as a graded- index optic. In some configurations, the waveguide 106 may be a radial symmetric waveguide or radially symmetrical waveguide.
  • the core index of refraction of the waveguide 106 may decrease along its length.
  • the core index of refraction may refer to an index of refraction positioned at or a proximate to a center of the waveguide 106. Additionally or alternatively, the core index of refraction may refer to an index of refraction positioned at or a proximate to a longitudinal axis of the waveguide 106.
  • the edge index of refection of the waveguide 106 may stay relatively constant.
  • the edge index of refraction may refer to an index of refraction positioned at or a proximate to the edge or periphery of the waveguide 106.
  • the central rays of the optical signals travelling through the waveguide 106 may be refracted towards higher radii while the outer rays propagate unaffected.
  • the optical device 100 and the waveguide 106 may decrease dispersion of the optical signals travelling through the fiber cores 102, 104, thereby increasing the length that multimode optical fibers may be used without decreasing signal quality.
  • the waveguide 106 may be implemented as an optical device that does not require electrical power.
  • the optical device 100 may increase the distances that optical signals may be transmitted through multimode optical fibers without requiring modifications to existing optical fibers, transceivers, or lasers.
  • the diameter of the waveguide 106 may be similar or the same as the diameter of the fiber cores 102, 104. As shown, the waveguide 106 includes a relatively constant diameter between the fiber cores 102, 104, and is generally aligned in a position between the fiber cores 102, 104. Although the diameter of the waveguide 106 is relatively constant, the index of refraction of the waveguide 106 is graded, thus it changes over the length of the waveguide 106. In some configurations, the diameter of the fiber cores 102, 104 and/or the waveguide 106 may be between 50-100 micrometers.
  • Figure 2 illustrates a schematic view of the refractive index profile of the optical device 100.
  • Figure 2 illustrates the changes of the refractive index profile of the waveguide 106 along the propagation direction of the optical signals.
  • the core index of refraction of the waveguide 106 decreases along its length and the index of refraction at the edge or proximate the edge of the waveguide 106 stays relatively constant.
  • Figure 2 includes example refractive index profiles 202a, 202b, 202c, 202d.
  • Each of the refractive index profiles 202a-d includes a refractive index at a corresponding core 204a, 204b, 204c, 204d of the waveguide 106.
  • the index of refraction at the cores 204a-d decreases along the length of the waveguide 106 in the propagation direction.
  • the index of refraction is largest at the core 204a of the index profile 202a, the index of refraction is relatively smaller at the core 204b of the index profile 202b, the index of refraction is further smaller at the core 204c of the index profile 202c, and the index of refraction is smallest at the core 204d of the index profile 202d.
  • Each of the refractive index profiles 202a-d includes a refractive index at corresponding edges 206a, 206b, 206c, 206d of the waveguide 106.
  • the index of refraction stays relatively constant at the edges 206a-d along the length of the waveguide 106 in the propagation direction.
  • the central rays may be refracted towards higher radii while the outer rays propagate unaffected. This changes the distribution of light within the waveguide by guiding the light into the ring-shaped region of higher refractive index. This produces a ring-shaped modal pattern which is more conducive to propagating long distances.
  • the optical device 100 may be positioned mid-span in an optical fiber.
  • the optical fiber may be a multimode optical fiber.
  • the optical fiber may be may be 1 km, 300 meters, 100 meters, 70 meters in length or less.
  • the optical device 100 may be implemented proximate or inside an optoelectronic transceiver.
  • an optical fiber may include the optical device 100.
  • the optical device 100 may be positioned between a first portion of the optical fiber and a second portion of the optical fiber.
  • the optical device 100 may be positioned between a first end of the optical fiber and a second end of the optical fiber.
  • the optical fiber may be a multi -mode optical fiber.
  • the optical device 100 may be a multi- mode optical device configured to receive, transmit, or propagate multi-mode optical signals. Additionally or alternatively, the optical fiber may be a shortwave optical fiber configured to receive, transmit, or propagate shortwave optical signals (e.g., optical signals in a shortwave spectrum range).
  • the optical device 100 may be a shortwave optical device configured to receive, transmit, or propagate shortwave optical signals (e.g., optical signals in a shortwave spectrum range).
  • an optical device may include a waveguide having a core index of refraction that decreases along a length of the waveguide and an edge index of refraction of the waveguide that is substantially constant along the length of the waveguide.
  • the optical device may be a radial symmetric waveguide.
  • the optical device may be a fiber stub or a graded-index optic.
  • the optical device may be positioned mid-span in an optical fiber.
  • the optical device may be optically coupled to a first fiber core and a second fiber core.
  • the optical device may include a constant diameter between the first fiber core and the second fiber core. The constant diameter may correspond to a diameter of the first fiber core and a diameter of the second fiber core.
  • the optical device may be mechanically coupled to a first fiber core and a second fiber core.
  • an optical fiber may include the optical device including some or all of the aspects described above.
  • the optical device may be positioned between a first portion of the optical fiber and a second portion of the optical fiber.
  • the optical device may be positioned between a first end of the optical fiber and a second end of the optical fiber.
  • the optical device and the optical fiber may be configured to propagate multi-mode optical signals and/or shortwave optical signals.
  • an optical device may include a waveguide having a first index of refraction proximate a center of the waveguide that decreases along a length of the waveguide and a second index of refection of the waveguide proximate a periphery of the waveguide that is constant along the length of the waveguide.
  • the optical device may be a radial symmetric waveguide, a fiber stub or a graded-index optic.
  • the optical device may be positioned mid-span in an optical fiber.
  • the optical device may be optically coupled to a first fiber core and a second fiber core and the optical device decreases dispersion of the optical signals travelling through the fiber cores.
  • the central rays of optical signals travelling through the optical device may be refracted towards higher radii while the outer rays propagate unaffected.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

Dans un exemple, la présente invention concerne un dispositif optique qui peut comprendre un guide d'ondes ayant un indice de réfraction de cœur qui diminue sur une longueur du guide d'ondes et un indice de réfraction de bord dudit guide d'ondes qui est constant sur la longueur de ce guide d'ondes. Les rayonnements centraux des signaux optiques se déplaçant à travers le guide d'ondes peuvent être réfractés vers des rayons plus élevés tandis que les rayonnements extérieurs se propagent sans être altérés. Le dispositif optique peut diminuer la dispersion des signaux optiques qui se déplacent à travers une fibre optique.
PCT/US2019/030047 2018-05-01 2019-04-30 Dispositif de conditionnement de mode optique mmf WO2019213163A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862665229P 2018-05-01 2018-05-01
US62/665,229 2018-05-01

Publications (1)

Publication Number Publication Date
WO2019213163A1 true WO2019213163A1 (fr) 2019-11-07

Family

ID=66530474

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2019/030047 WO2019213163A1 (fr) 2018-05-01 2019-04-30 Dispositif de conditionnement de mode optique mmf

Country Status (2)

Country Link
US (1) US10795078B2 (fr)
WO (1) WO2019213163A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10935720B2 (en) * 2019-04-29 2021-03-02 Ii-Vi Delaware, Inc. Laser beam product parameter adjustments

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723828A (en) * 1984-11-09 1988-02-09 Northern Telecom Limited Bandwidth enhancement of multimode optical transmisson lines
US20070206912A1 (en) * 2005-11-03 2007-09-06 Aculight Corporation Apparatus and method for a waveguide with an index profile manifesting a central dip for better energy extraction
US7340138B1 (en) * 2007-01-25 2008-03-04 Furukawa Electric North America, Inc. Optical fiber devices and methods for interconnecting dissimilar fibers
US20110110627A1 (en) * 2009-11-07 2011-05-12 Dr. Chang Ching TSAI Beam collimator
WO2016178595A1 (fr) * 2015-05-07 2016-11-10 Huawei Technologies Co., Ltd. Coupleur optique à guide d'ondes à gradient d'indice

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909110A (en) * 1974-11-11 1975-09-30 Bell Telephone Labor Inc Reduction of dispersion in a multimode fiber waveguide with core index fluctuations
US4205901A (en) * 1975-07-17 1980-06-03 International Standard Electric Corporation Limited mode optical fiber
FR2699293B1 (fr) * 1992-12-15 1995-03-03 France Telecom Système optique monolithique comportant des moyens de couplage perfectionnés entre une fibre optique et un phototransducteur.
US5719973A (en) * 1996-07-30 1998-02-17 Lucent Technologies Inc. Optical waveguides and components with integrated grin lens
FR2815421B1 (fr) * 2000-10-16 2003-09-19 France Telecom Collimateur optique pour fibres monomodes, fibre monomode a collimateur integre et procede de fabrication
JP2002196181A (ja) * 2000-12-25 2002-07-10 Nippon Sheet Glass Co Ltd レンズ機能付き光ファイバおよびその製造方法
US7391948B2 (en) * 2002-02-19 2008-06-24 Richard Nagler Optical waveguide structure
US7920763B1 (en) * 2007-02-09 2011-04-05 Agiltron, Inc. Mode field expanded fiber collimator
US9158070B2 (en) * 2008-08-21 2015-10-13 Nlight Photonics Corporation Active tapers with reduced nonlinearity
US8509577B2 (en) * 2010-07-02 2013-08-13 St. Jude Medical, Inc. Fiberoptic device with long focal length gradient-index or grin fiber lens
CA2919002A1 (fr) * 2013-07-22 2015-01-29 Adc Telecommunications, Inc. Ensemble cable et connecteur de fibre optique a faisceau elargi et procedes de fabrication associes
JP6396696B2 (ja) * 2014-06-26 2018-09-26 株式会社トプコン 光波距離計
US10429589B2 (en) * 2017-02-07 2019-10-01 Corning Incorporated Optical fiber for silicon photonics
US10222623B2 (en) * 2017-04-26 2019-03-05 Raytheon Company Composite graded-index fiber mode field adaptor for high-aspect-ratio core optical fibers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723828A (en) * 1984-11-09 1988-02-09 Northern Telecom Limited Bandwidth enhancement of multimode optical transmisson lines
US20070206912A1 (en) * 2005-11-03 2007-09-06 Aculight Corporation Apparatus and method for a waveguide with an index profile manifesting a central dip for better energy extraction
US7340138B1 (en) * 2007-01-25 2008-03-04 Furukawa Electric North America, Inc. Optical fiber devices and methods for interconnecting dissimilar fibers
US20110110627A1 (en) * 2009-11-07 2011-05-12 Dr. Chang Ching TSAI Beam collimator
WO2016178595A1 (fr) * 2015-05-07 2016-11-10 Huawei Technologies Co., Ltd. Coupleur optique à guide d'ondes à gradient d'indice

Also Published As

Publication number Publication date
US20190339454A1 (en) 2019-11-07
US10795078B2 (en) 2020-10-06

Similar Documents

Publication Publication Date Title
US11099321B2 (en) Optical fibers for single mode and few mode VCSEL-based optical fiber transmission systems
US7267494B2 (en) Fiber stub for cladding mode coupling reduction
US10969540B2 (en) Multimode optical fiber transmission system including single mode fiber
US10447423B2 (en) Bidirectional, multi-wavelength gigabit optical fiber network
US6185346B1 (en) Propagation in lowest order modes of multimode graded index fiber, resulting in: very low transmission loss, low modal noise, high data security, and high data rate capabilities
US9692515B2 (en) Multimode optical transmission system and method employing HOM-filter fiber
EP3761088A9 (fr) Fibre optique multinoyau
US10451803B2 (en) Multimode optical transmission system employing modal-conditioning fiber
US10295734B2 (en) Optical fiber for both multimode and single-mode operation and transmission system therefor
US11467335B2 (en) Optical fibers for single mode and few mode vertical-cavity surface-emitting laser-based optical fiber transmission systems
US9268093B2 (en) Systems and methods for converting legacy multimode links to longer-wavelength links
WO2015116279A2 (fr) Câbles à fibre optique et modules présentant une compensation de dispersion modale
US10795078B2 (en) MMF optical mode conditioning device
US8761217B2 (en) Modal filters for modulatable sources
CN103842870A (zh) 用于可调制的源的多模光纤
US11156770B2 (en) Coupled multicore optical fiber
US10816734B2 (en) Multimode optical transmission system employing modal-conditioning fiber
US6476951B1 (en) Use of mode coupled optical fiber in communications systems
EP2390697A1 (fr) Dispositif de connexion pour fibres optiques
US11835754B2 (en) SMF to MMF coupler
WO2023038769A1 (fr) Fibres optiques pour systèmes de transmission à fibre optique à base de vcsel monomode et peu modale
CN115542472A (zh) 一种光模块及网络设备
WO2013076746A1 (fr) Dispositif de connexion pour fibres optiques

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19723965

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19723965

Country of ref document: EP

Kind code of ref document: A1